Stick masking tape above and below where you re going to seal.
Should a shower door frame be sealed with silicone underneath.
Grout isn t suitable for sealing around your bathtub or shower tray as it s not flexible and will crack as soon as any weight is placed on the tub or tray.
For a shower door or enclosure to work correctly it must be installed in accordance with the manufacturer s instructions.
Silicone sealant is added to the joints between the glass and tile the perimeter to prevent leaking.
Broadly speaking the shower tray should be level and fully sealed to the tiles before the enclosure is installed the sides of shower enclosure should be vertically plumb and fixed securely to tiled walls.
Silicone sealant should be applied vertically on the inside and outside where the shower enclosure fixes to the tiled walls and importantly on the outside only.
Either way it is the inside edges on the verticles.
And only the outside edge on the tub or shower b.
If i understand your question correctly we assume you are talking about a glass shower set like a neo angle shower or a glass door set on a tub.
If you find frameless shower door leaks at both the sides of the glass then you will have to seal the gap between the door and the adjacent glass wall.
I always try to talk people out of using silicone on frameless enclosures of this type.
Caulk made of pure silicone or siliconized latex acrylic i e latex or acrylic caulk with added silicone adheres well to common shower and tub materials including porcelain ceramic stone.
Invest in a shower door side seal to solve the leakage issue from the sides.
I m sorry to hear about the mix up with your shower enclosure.
Solutions for fixing the leaks on either side of the frameless shower door.